Some Brains Have Alzheimer's Signs but Stay Sharp—Study Sheds Light on Why
Summary
A study published in Cell Stem Cell found that people who stayed cognitively healthy despite Alzheimer’s-related brain changes had more immature neurons in the hippocampus, a brain region involved in learning and memory. The researchers say these cells may support cognitive resilience, but the study does not establish that they prevent dementia.Key Facts
- Researchers examined postmortem human brain tissue.
- The study focused on the hippocampus, which is important for learning and memory and is affected by Alzheimer’s disease.
- People with Alzheimer’s-related brain changes who remained cognitively healthy had more immature neurons than people with dementia.
- The immature neurons showed distinct molecular features associated with Alzheimer’s pathology and cognitive resilience.
- Researchers said genetics, exercise and lifelong learning may contribute to resilience, though the study did not establish how these factors affect the neurons.
- The study’s findings may inform future research on therapies that support the brain’s repair mechanisms.
- The article reports that an estimated 30 percent of people with Alzheimer’s pathology do not develop clinical symptoms.
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